These are diagrams of female/male preflowers and alternating nodes. I've read plants can tolerate up to 90 deg temps.

Growery - Optimal Humidity (rH) and Temperature Ranges for Cannabis
Optimal Temperature:Between 70-85 degrees Fahrenheit (21 - 29 degrees Celsius).
Optimal Humidity: 60-70% rH for vegetative growth. 40-60% rH during flowering (lower rH helps to reduce the risk of fungal contamination on your already moist dank buds).

Night temperatures should be kept above 60 degrees to prevent stress. It is preferable during flowering to have a night temperature drop of 10-20 degrees to stimulate flowering hormones and reduce stem elongation.
If you are supplementing your grow space with additional carbon dioxide (CO2), your target daytime temperature should be between 80 - 90 degrees (F), until the last two weeks of flowering when daytime temps should be kept about 10 degrees lower and CO2 can be reduced to adjust for the lower metabolic rate of the mature plant.

Attachment 291660